Varies directly: [tex]\frac{y}{x} = k[/tex]
First, solve for k. Then replace the k-value into the equation and cross multiply to solve for the missing variable.
[tex]\frac{10}{8} = k[/tex] ⇒ [tex]\frac{5}{4} = k[/tex]
[tex]\frac{30}{x} = \frac{5}{4}[/tex]
30(4) = 5(x)
6(4) = x divided both sides by 5
24 = x
Answer: 24
